I dont really remember to be honest - (which probably means that they werent 'real' comedowns, like the ones I experienced back when I used to do Cocaine;blocked nose/flu, uncontrollable crying, intense depression etc..)
Either way, as an update for everyone - I feel really great again, no longer paranoid about something going wrong .. Even went into school today, went out for a drink after with friends.. I think maybe the paranoia about something going wrong WAS my comedown? Either way, I've decided I'm gonna be staying away from the stuff for at least a year (following on from what @darksidesam mentioned)
Thank you so much to everyone who took the time to respond